1 files changed, 7 insertions, 0 deletions
diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
index 84f1359f37..b5215214d1 100644
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -583,6 +583,13 @@ class BasicUDPTest(ThreadedUDPSocketTest):
     def _testRecvFrom(self):
         self.cli.sendto(MSG, 0, (HOST, PORT))
 
+    def testRecvFromNegative(self):
+        # Negative lengths passed to recvfrom should give ValueError.
+        self.assertRaises(ValueError, self.serv.recvfrom, -1)
+
+    def _testRecvFromNegative(self):
+        self.cli.sendto(MSG, 0, (HOST, PORT))
+
 class TCPCloserTest(ThreadedTCPSocketTest):
 
     def testClose(self):